varna vs rajanya

varna and rajanya both are nouns.

Word	Noun	Adjective	Verb	Adverb
varna	Yes	No	No	No
rajanya	Yes	No	No	No

As nouns, rajanya is a hyponym of varna; that is, rajanya is a word with a more specific, narrower meaning than varna:

varna: (Hinduism) the name for the original social division of Vedic people into four groups (which are subdivided into thousands of jatis)
rajanya: the second highest of the four varnas: the noble or warrior category

Other hyponyms of varna include brahman, brahmin, vaisya, shudra, sudra.

varna (noun)	rajanya (noun)
(Hinduism) the name for the original social division of Vedic people into four groups (which are subdivided into thousands of jatis)	the second highest of the four varnas: the noble or warrior category